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Modified polytetrafluoroethylene composite material, preparation method thereof and sealing system

A technology of polytetrafluoroethylene and composite materials, which is applied in the direction of engine seals, mechanical equipment, engine components, etc., can solve problems such as shaft sleeve wear, and achieve the effects of reducing friction, improving sealing effect, and high thermal stability

Active Publication Date: 2017-06-13
青岛汉兴新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a modified polytetrafluoroethylene composite material and a sealing system using the composite material as a sealing lip. The sealing system provided by the present invention solves the problem of severe wear of the sealing lip to the shaft sleeve in the prior art. problem, improved sealing efficiency

Method used

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  • Modified polytetrafluoroethylene composite material, preparation method thereof and sealing system
  • Modified polytetrafluoroethylene composite material, preparation method thereof and sealing system
  • Modified polytetrafluoroethylene composite material, preparation method thereof and sealing system

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preparation example Construction

[0045] The present invention also provides a preparation method for the modified polytetrafluoroethylene composite material described in the above technical solution, comprising the following steps:

[0046] The components described in the above technical scheme are freeze-dried and then mixed to obtain a mixed material;

[0047] Pressing the mixed material in a mold to obtain a billet;

[0048] The blank is sintered to obtain a composite material.

[0049] In the present invention, the raw materials of the components described in the above technical solution are preferably freeze-dried, and then sieved to obtain the components with the granularity described in the above technical solution. The present invention has no special limitations on the freeze-drying method and equipment used, and the freeze-drying technical solution well known to those skilled in the art can be adopted. In the present invention, the freeze-drying temperature is preferably -20°C to -30°C; the freeze...

Embodiment 1

[0071] Freeze-dry 73g (or kg) of polytetrafluoroethylene, 12g (or kg) of glass fiber, 7g (or kg) of molybdenum disulfide and 8g (or kg) of graphite at -25°C for 1 hour, Add to the three-dimensional mixer and mix evenly at high speed, the mixing condition is 6000r / min to obtain the mixed material;

[0072] Add the obtained mixed material into the semi-finished mold, press it into a blank under a pressure of 45MPa, and sinter the blank at a high temperature of 380°C for 12 hours to obtain a semi-finished product;

[0073] A reflow thread is machined on the inner surface of the semi-finished product, and the vertical depth of the reflow thread is 0.1mm.

[0074] The stainless steel metal housing has an O-ring mounting groove and a one-way valve mounting groove. Assemble the sealing lip, O-ring, check valve and metal casing together and press it into a shaft seal. Finally, the shaft seal is shaped into the desired shape.

[0075] Quench the 102Cr6 stainless steel bushing, then ...

Embodiment 2

[0077] Freeze-dry 70g (or kg) of polytetrafluoroethylene, 15g (or kg) of glass fiber, 5g (or kg) of molybdenum disulfide and 10g (or kg) of graphite at -25°C for 1 hour, Add to the three-dimensional mixer and mix evenly at high speed, the mixing condition is 6000r / min to obtain the mixed material;

[0078] Add the obtained mixed material into the sealing lip mold, press it into a blank under a pressure of 45MPa, and sinter the blank at a high temperature of 380°C for 12 hours to obtain a semi-finished product;

[0079] A reflow thread is machined on the inner surface of the semi-finished product, and the vertical depth of the reflow thread is 0.05mm.

[0080] The stainless steel metal housing has an O-ring mounting groove and a one-way valve mounting groove. Assemble the sealing lip, O-ring, check valve and metal casing together and press it into a shaft seal. Finally, the shaft seal is shaped into the desired shape.

[0081] Quench the 102Cr6 stainless steel bushing, then ...

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Abstract

The invention provides a sealing system for oil sealing. The sealing system comprises a shaft sleeve (2), a shaft seal and at least one group of sealing lips and an O-ring, wherein the sealing lips are arranged outside the shaft sleeve, first backflow threads are arranged on the inner surfaces of the sealing lips, second backflow threads matched with the first backflow threads are arranged on the outer surface of the shaft sleeve, and the sealing lips are made of a modified polytetrafluoroethylene composite material provided in the technical scheme. Oil in an engine can be sealed through cooperation of the sealing lips made of the modified polytetrafluoroethylene composite material with the shaft sleeve, and leaked oil can be pumped into a machine through the first backflow threads (3) on the sealing lips and the second backflow threads (1) on the shaft sleeve; a lubricating oil film is formed in a contact position of each lip port and a shaft by means of the pumped back oil, wear of the lip ports is reduced, and the service life of the oil seal is prolonged. The sealing system has good sealing effect and high sealing efficiency.

Description

technical field [0001] The invention relates to the technical field of mechanical equipment oil seals, in particular to a modified polytetrafluoroethylene composite material, a preparation method thereof and a sealing system. Background technique [0002] In industrial production, oil seal is a widely used sealing method, which is widely used in rotating equipment and its auxiliary equipment to block the leakage of lubricating oil or other working media. At present, the premature aging of the sealing lip and the low efficiency of the oil seal of the seal are relatively common failure modes, and they are the two main problems that need to be solved urgently. [0003] Compared with traditional rubber materials, PTFE material has many excellent qualities such as better weather resistance, friction resistance, corrosion resistance, high beating resistance, eccentricity resistance and high line speed, so PTFE oil seal came into being pregnancy. Although this technology solves t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/18C08K3/30C08K7/14C08K3/04F16J15/3204F16J15/324
CPCC08K3/04C08K3/30C08K7/14C08K2003/3009F16J15/3204F16J15/324C08L27/18
Inventor 刁立鹏
Owner 青岛汉兴新材料有限公司